Question

(a)State modern periodic law. Name the scientist who stated the law.

(b) What is a periodic table? How many groups and periods does modern periodic table have?

Answer 1

(a) The modern periodic law states that "The properties of elements are the periodic functions of their atomic number." Henry Moseley put forward the modern periodic law.

b) A tabular arrangement of the elements in groups (vertical columns) and periods (horizontal rows) highlighting the regular trends in properties of elements is called a Periodic Table. Modern Periodic table has 7 periods and 18 groups.